Answer:
Fixing code in a software program.
Explanation:
In software development there is a life cycle, for example, analyze, design and programming, we can create a beta of our software, this is a phase of our unfinished program.
There are certificated professionals called tester, these people can make a test of our program, and provide a full report about problems in the system, with this report we can replace the old code with new code, we are fixing code in our software program.
